Thomas Cullen

Specimen of carletonite with prisms of blue and pink all around. There is one large square crystal with a small blue square in the middle with pink on the outside on the upper right side of the specimen. It sits on a black background. At the Canadian Museum of Nature.

It’s Geodiversity Day & Mineral Monday!! So I wanted to show you a rare mineral called carletonite, which is usually bright blue but seen here with a pink zonation. It was discovered here in Canada, at the mineral species rich Mont Saint-Hilaire. #GeodiversityDay #MineralMonday #GeoscienceBluesky ⚒️🧪

Opportunities matching 'earth' Search 4 Careers available at University of Calgary.

🚨FOUR tenure track positions in my dept @ucalgary.bsky.social @ucalgaryscience.bsky.social in applied & computational geophysics, subsurface geochemistry, sedimentary geology, and sustainable soil science. careers.ucalgary.ca/search/jobs?...

(please reskeet widely!) #academicsky 🧪⚒️🇨🇦

Donate to Help Dr. Tsogtbaatar, Icon of Mongolian Paleontology, organized by Lindsay Zanno Renowned Mongolian paleontologist Dr. Khishigjav Tsogtbaatar is fig… Lindsay Zanno needs your support for Help Dr. Tsogtbaatar, Icon of Mongolian Paleontology

A brilliant palaeontologist, Dr Tsogtbaatar, is facing a tough battle and needs help with medical expenses. Please consider donating or sharing the link: every bit truly helps. Thank you!

Reconstructed skull of the holotype specimen of Tyrannosaurus rex

The 1905 and 1906 reconstructions of the skeleton of Tyrannosaurus rex

T. rex by Julius Csotonyi

Skull of Albertosaurus sarcophagus at the Royal Tyrell Museum of Palaeontology

Happy 120th Nameday, Tyrannosaurus rex and Albertosaurus sarcophagus!

A muscular figure with blonde hair raises a clenched fist, wearing a red tunic against a blue background.

Joseph Montferrand is a legendary French-Canadian folk hero.
A logger who stood up for Francophones, his legend has grown with tales of his strength.
Also known as Big Joe Mufferaw, he inspired the Ottawa Redblacks' mascot Big Joe.
This is his story.

🧵 1/12

A job ad with multiple images, including the exterior of the museum, a view of collections (jars on shelves), and pictures of some cool, tropical fish but I don't know enough about fish to describe them other than to say they're pretty colors of yellow and blue/green

🚨We're hiring! The Sam Noble Oklahoma Museum of Natural History is seeking a tenure-track split position as Assistant Curator of Ichthyology and Assistant Professor of Biological Sciences. Please retweet & share with colleagues! 🐟🐠🧪

Apply here: apply.interfolio.com/174674

Corner display with a verdant mural of dinosaurs and other creatures in a swamp, over four cases with small fossils.

View of right side of mural, with resting T. rex in the center.

View of left side of the mural, with Pachycephalosaurus among some cypress

Big T. rex skeleton on platform, mural visible in the far distance

At long last, Beth Zaiken’s spectacular He’ll Creek mural is permanently installed in the Sue gallery!

Ahh you love to see it

Specimen made up of many small cubes making branches off a base. The specimen is fluorescing orange with a black background. At the Royal Ontario Museum.

Take a pause from the stress in choosing your votes for Mineral Cup and refresh your palate with this fluorescent bright orange coral-like halite. Minerals are just so cool. #MineralMonday #GeoscienceBluesky #MinCup25 ⚒️🧪

Large T. rex skull seen from the front in a glass case. The right side is much flatter than the left. At the Field Museum.

Real skull of Sue the T. rex!! Did you know the one on the full display is a cast that removed the distortion due to crushing that we see here. #FossilFriday ⚒️🧪🦖

Introducing FAMM: An Open‐Access Database of Fossil Arctic Marine Mammals Motivation The Arctic is currently experiencing the strongest effects of climate change on Earth. These effects, including sea ice loss, are already modifying the ecologies of the 11 species of mari...

FAMM will be particularly useful for researchers seeking to use inter-disciplinary techniques to understand how #Arctic #marine #mammals will respond to the current #ClimateCrisis

Open-Access Link: onlinelibrary.wiley.com/doi/10.1111/...

🧵 🦴/🦴

Repeated climate-driven dispersal and speciation in peripheral populations of Pleistocene mastodons Coastal mastodon mitochondrial genomes contextualize species distributions and dispersal patterns near southern glacial limits.

It lives!!! 🦣🦣🦣🧪

Repeated climate-driven dispersal and speciation in peripheral populations of Pleistocene mastodons | Science Advances www.science.org/doi/10.1126/...

Dinosaur extinction can explain continental facies shifts at the Cretaceous-Paleogene boundary - Communications Earth & Environment Dinosaurs promoted open habitats in the Late Cretaceous, and their extinction could have led to a radical reorganization of the landscape and ecosystem structure at the beginning of the Paleogene, acc...

Dinosaurs as ecosystem engineers!

Weaver, L.N., Tobin, T.S., Sprain, C.J. et al. Dinosaur extinction can explain continental facies shifts at the Cretaceous-Paleogene boundary. Commun Earth Environ 6, 712 (2025). doi.org/10.1038/s432...

Taphonomy of aquatic insects from the Crato Formation Lagerstätte (Aptian, Lower Cretaceous) under an actualistic look The Crato Formation (Aptian, Lower Cretaceous) is a fossiliferous deposit of global significance, representing a lacustrine palaeoenvironment which offers insights into aquatic insect taphonomy. Despi...

New paper alert! In our new paper @plosone.org, lead author Arianny Storari collected, reared, and analyzed decay and disarticulation of hundreds of aquatic insects, and compared them to Crato Formation fossils to figure out what happened to them before they fossilized.

doi.org/10.1371/jour...

Morphological adaptations for migration in North American wood-warblers (Aves: Parulidae) - Journal of Ornithology Migration exerts a selective pressure for increased flight efficiency and reduced energy expenditure in long-distance migratory birds. In North America, eastern migratory flyways are longer and requir...

Excited to share our new paper on flight morphology and migration in North American wood warblers. Surprisingly, ground-dwelling warblers may be better adapted for migration than aerial ones!!!

link.springer.com/article/10.1...

Not enough people know that you don't hear about the holes in the ozone layer anymore because an international agreement banning production of chlorofluorocarbons was wildly successful and the ozone has recovered since.

Change is possible.

None of this is inevitable.

We can choose differently.

A potential deinocheirid ornithomimosaur from the Judith River Formation (Upper Cretaceous: Montana, U.S.A.) and its paleobiogeographic implications Here, we describe a potential deinocheirid ornithomimosaur from the Upper Cretaceous Judith River Formation of Montana, represented by isolated left and right dentaries. Compared with ornithomimids...

A potential deinocheirid ornithomimosaur from the Judith River Formation (Upper Cretaceous: Montana, U.S.A.) and its paleobiogeographic implications: Journal of Vertebrate Paleontology: Vol 0, No 0 - Get Access www.tandfonline.com/doi/full/10....

🐺 Happy to share our recent article, “The dire wolf resurrection that wasn’t”
anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...
Thanks to my awesome co-authors Annie Burrows, Adam Hartstone-Rose, and Mike Jensen-Seaman!

Evolution Conference Information Evolution 2026 Cleveland needs a logo! Submit your design(s) to evolution.meetings@gmail.com with the subject header 'logo contest 2026'  Guidance: 3-4 colors maximum try to avoid single organism...

Evolution Meeting 2026 logo contest! The winner will receive meeting registration and an Evolution 2026 t-shirt. www.evolutionmeetings.org/2026-logo-co...

October 1 deadline for @nhm.org Student Collections Study Award. Get some $$ to spend time collecting data in our collections, including @tarpits.org
Open to:
- current undergraduate and grad students
- *not* local to Los Angeles (international applicants welcome)
More:
nhm.org/student-coll...
🧪

The common ancestor of Primates was found in a cold climate within North America

The drift in tectonics, climate, and distribution of niches can significantly alter our view on the evolution if only use neontological data. That's why this study of primate origins is so awesome: the modern distribution gives little in understanding
doi.org/10.1073/pnas...
🧪 ⚒️ #Paleobio #EvoBio

Macroevolutionary role reversals in the earliest radiation of bony fishes Troyer et al. examine lower jaw evolution in Silurian-Devonian bony fishes and find substantial differences in patterns of morphological disparity, rates of shape evolution, and functional diversity b...

Excited to announce that the 1st paper from my postdoc is now out in @currentbiology.bsky.social ! Using a large dataset of 3D preserved fossils, we explore the diversification of jaws in early bony fishes. 1/15
www.cell.com/current-biol...

Exhibit Projects Manager - Martinsville, VA - Indeed.com VA Museum of Natural History

The Virginia Museum of Natural History is hiring a full-time Exhibit Projects Manager.

www.indeed.com/viewjob?jk=e...

Weekend reflection on Spicomellus & difficulty funding fieldwork. We were lucky to get some funds from NHM & UoB but major funders turned us down. Only generous support from BILNAS made this project possible.

Funding fieldwork is often considered ‘risky’ yet our results were published in Nature.

Princeton Postdoctoral Fellowship in Geosciences 2026–27 |HigherJobz Apply now for the Princeton University Postdoctoral Fellowship in Geosciences 2026–2027, USA. Competitive salary - Deadline: Oct 1, 2025.

Postdoctoral Fellowship in Geosciences – Princeton University, USA
Harry Hess Fellows Program 2026–27
Eligibility: PhD
Deadline: 1 October 2025
Details: higherjobz.com/princeton-po...

#Postdoc #AcademicJobs #USAJobs #ScienceCareer #PostdoctoralFellowship #EarthSciences
@princetonupress.bsky.social

Extreme armour in the world’s oldest ankylosaur Nature - The ankylosaurian dinosaur Spicomellus afer possessed a tail weapon and uniquely elaborate dermal armour.

If you don't have access to Nature, but would like to read our paper on the new specimen of #Spicomellus, you can read it online at this link with no subscription: rdcu.be/eCJK3

'Punk rock' dinosaur with metre-long spikes discovered The animal has come as a surprise to experts, who now have to rethink how these armoured dinosaurs evolved

Congratulations @tweetisaurus.bsky.social on bringing Spicomellus afer to the world! Susie’s article is now out in Nature 👉 www.nature.com/articles/s41...

Also, www.bbc.co.uk/news/article...

Assistant Professor in Paleoclimatology - Honolulu, HI - Indeed.com University of Hawaii

Full-time, 9-month, Tenure-track Assistant Professor in Paleoclimatology position at the University of Hawaii.

www.indeed.com/viewjob?jk=4...

Want to do a PhD on White Sharks using high-powered imaging to analyse form and function of their teeth and jaws?

You will work with me and the dream team @charlie-huveneers.bsky.social @meyer-sci.bsky.social @weisbeckerbblab.bsky.social & #SARDI at Flinders Uni

🦈🦷🦴 Interested? Get in touch!

Postdoctoral Researcher All Job Postings will close at 12:01a.m. CST (1:01a.m. EST) on the specified Closing Date (if designated). If you close the browser or exit your application prior to submitting, the application progre...

Fun news: I'm hiring a postdoc in ichthyology!

Please spread the word #TeamFish, and message me if you have questions.

(Job requisition id is R00107333 if LSU link below takes you elsewhere.)

lsu.wd1.myworkdayjobs.com/en-US/LSU/de...